<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <!-- 1.内部样式 -->
    <style>
        div{
            color: red;
            font-size: 30px;
        }
    </style>
    <!-- 3.引用外部样式文件 -->
     <link rel="stylesheet" href="css/hello.css">
</head>
<body>
    <!-- 2.行内样式 -->
    <p style="color: blue; font-size: 40px; background: pink;">aaa</p>
    <div>bbb</div>
    <h3>ccc</h3>
    <span>ddd</span>
    <p>eee</p>
    <div>fff</div>
</body>
</html>